So you wish to replace your 120V surround sound receiver, if I'm understanding you correctly?
There are a lot of good choices out there. I have a Panasonic XA-58 at home. It is no longer made but is a really good receiver, 95 watts/6 channels, measured, through a splendid Class D amp.
In the TT, I use an older NAD stereo receiver with two pairs of speakers. The NAD has no lower LFE channel and doesn't decode 5.1, 7.1 or other. I don't feel I'm missing much.
I would suggest to look for an inexpensive surround sound receiver at one of your local electronic outlets. It will have the connectivity you need and doesn't have to have all the bells and whistles as a typical, higher end residential unit. Yamaha and Pioneer are two names I trust.